Tool retainer



June 30, 1931. a. T. HIRCOURT ,5

TOOL RETAINER med April 22. 1929 11 VEN TOR. George 7" f/arcaur-f ATTORNEY.

Patented June 30, 1931 {TED STAT PATE NT? :OFVF 'C E GEoRGEeT; rmnoonnm, on DETROIT, MICHIGAN, ASSIGnon 17o en rqneo rivEpnnrrIo wooL ooMrANY, on NEW yon-K, 1v. -Y., e oonronn'ron on NEW JERSEY seem l d ,Anril 22 This invention relates 'to percussive chines and tools andmore particnlarly tode v c for elea ab e ecuri g h W king teal in ,operative relation -tothe machine.

One object of the invention is to hold a Workingtool in plaee to rece-ive blowsand to permit its g uiek removal and replacement when desired. Anotherobject is to provide arsirnple, cornpact retaining ,device which is economical .to manufaotur assemble a Well as highly convenient to use, Other objects will be apparent from ,the detailed deseription which follows.

' In order to illustrate theinvention, one concrete\e nbodin entgthereof is shown in the accompanyingdrawings, in which :T-

Fig. 1 is aside elevational view ,of a percussive tool partlyhreken away and showing, i se on, th r t n app i dt re is a fragmentary sectional View of the forward end of the hammer hairrelshowingi a Workingvtool heingremo ved. therefrom .anc i v 7 Fig. 3 is a ,front end. elevational View. ofthe retainer assembly.

The retainer 1 of the present invention is sh n i e- 1 Y o th ccempanyin e ,ings as. applied to a barrel A of; a percussive motor vontool, inthe presentinstance a pneuimatic riveting hammer. Thehammer harrel A has adjacent the forward 1 end thereof the conventional annular groove a upon the exteriorthereof. A {Working toolflofany desir f rmys cha a rr e ls rB, h Sh k ,1) (intending ,vvithi-n thebo re of the hammer bar .A to r ce e-memoirs Q t mpas member or piston, a .(Fig. 2) Bivet set B has the conYQIltiQIral broad annnlarretaining rem v vb- Theretainer consist-set ,a sleeve .i'or tele-' .sc pingengagementwiththeend of thehamnerharrel and pr-o-vided at one end w th an inwardly projecting .Li or flange .4 which seats in" groove ain I the hammer barrel vvhen ath ret e 5 appli hereto, a ,hindie lt .in Eigs. .1 and {llhe sleeve is'hy prefere cemad elp e aplnra y rwat Pa i the p esen ns a i in number 5am r6, ssae a ly s i cula in m and ha i a it-h ends .remete rQm reta ning ri f 1929. Serial No. 357,}61.

series of radial bores 5a a nd 6a, respectively, in Which are mounted pins 7, in the present instance six in number, three in each of the lee p rt 5 a dfi a equ i y sea de e the periphery of the retaining sleeve. Pins 7 have heads 7a which limittheir proje tion throughlooreseaand 6a. Theinnerrounded ends of the pins when at the limit of their inward movement, engage rivet set B within thelloroad groove 1) thereof. A n annulus 8 telescopes over the exterior or" theretaining l endhas wPQ iQ l tl bl tt n the same, a broad portion 1 for holdingpinsl' at the limit of their inward projection 1), and a tapered portion 11 for permitting the pins to retract in bores heand 6a forthe insertion and removal of a orkingtool sneh as v t s B i 2); Av c i pr 2, encircling the exterior of the sleeve parts '5 and 16, is compressed bG tW'QQD. an exterior fiangeo'r abutment 13 on the innerend of sleeve parts 5 and 6 anchtheslidableannulus 8, thereby having the double function of holdthe ret'ainerin assembled relation securey up n h ham ber e faed1 sldine y maintaining annulus 8 at the limit ofits out- Ward rnovement (Fig. 1) with pins in engagingeontact With-the retaining groove on the Working tool 13. i

lVith theretainer assembly in place on the hammer-barrel.if the operator Wishes to insert or remove a Working tool such as B, he

slides annulus 8 rearvvardly toward abutment 13 to the positlon shown in F g.2 since'in th s position, the tapered portion 11 of the a-nn ilus l errnits sto a pins 7 to move outwardly far enough to pass the broadest diameter .of the working too-l. \Vhen shankb" of the Working .tool is fully Within the l annnerharrel; the tool is substantially in the position shown in Fig. 1. Annulus Sis then released under the pressure of the spring 12 moves ontwvardly until portion9 engages heads 7a of pins/7 and the pins 7 arelocked in their in ard position by portionlO of the annulus;-

From the above it ill beapparent that the retainer assembly comprises but a feweasily manufactured parts which can be uickly assemble cl and applied to. the'barrels ofconventional percussive motors for retaining conventional. working tools in place, that once the tool is inserted it is securely locked in place until annulus 8 is manually retracted but that excessive shocks may be taken care of without breakage to parts by the yielding of the single coil spring 12 which has the dual function of holding the retainer parts in assembled relation on the hammer barrel and of maintaining the annulus 8 in position to lock the stop pins 7 in tool engaging position.

lVhile the invention is herein disclosed in what is now considered to be a preferred form, it is to be understood that the invention is not limited to the specific details thereof, but covers all changes, modifications, and adaptations within the scope of the appended claims.

I claim as my invention:

1. The combination with a percussive motor having a barrel into which a working tool is to be inserted, of retaining means for the tool engaging said barrel, and means comprising a sleeve having inwardly projectable members, an annulus in telescoping engagement with the exterior of said sleeve, and resilient means having the dual function of holding said sleeve on said barrel and or" yieldingly maintaining said annulus in position to hold said members in tool engaging position.

2. In combination, a barrel into which the shank of the working tool is to be inserted, and a retainer for holding the working tool in place comprising a split sleeve, interengaging parts on said barrel and said sleeve, inwardly projecting members on said sleeve for engagement with the tool, means for holding said members in tool-engaging position and resilient means encircling the exterior of said sleeve and arranged to hold said parts in engagement and said holding means in operative relation with said members.

3. In combination, a barrel into which the shank of a working tool is to be inserted, said barrel having an annular groove, and a re tainer for holding the working tool in place comprising arcuate parts forming a sleeve for telescoping engagement with the end of said barrel, an inner rib on said parts to fit said barrel groove, a coil spring encircling said parts to hold the same in assembled relation and in engagement with said barrel, and means supported by said arcuate parts and acted upon by said spring for engagement with said tool.

4. In combination, a barrel into which the shank of a working tool is to be inserted, and a retainer for holding the working tool in place comprising arcuate part-s forming a sleeve for telescoping engagement with the end of said barrel, interfitting means on said barrel and on said parts, a coil spring encircling said parts to hold the same in assembled relation and in engagement with said barrel, abutments for said spring adjacent the opposite ends of said sleeve, one of said abutments being movable, and means controlled by said movable abutment for engagement with said tool.

5. In combination, a percussive motor having a barrel into which the shank of a working tool is to be inserted, said barrel having an annular groove, and a retainer for holding the working tool in place comprising arcuate parts forming a sleeve for telescoping engagement with the end of said barrel, an inner rib on said parts to fit said barrel groove, a coil spring encircling said partsto hold the same in assembled relation and in engagement with said barrel, abutments for said spring adjacent the opposite ends of said sleeve, one of said abutments being movable, and stop means movable inwardly to engage said tool and controlled by said movable abutment.

6. In combination, a percussive motor having a barrel into which the shank of a worl ing tool is to be inserted, and a retainer for holding the working tool in place comprising arcuate parts forming a sleeve for telescoping engagement with the end of said barrel, interfitting means on said barrel and on said parts, a coil spring encircling said parts to hold the same in assembled relation and in engagement with said barrel, abutments for said spring adjacent the opposite ends of said sleeve, one of said abutments being movable and in the form of an annulus in telescoping engagement with said sleeve parts, and means controlled by said annulus for engagement with said tool.

7. In combination, a percussive motor having a barrel into which the shank of a working tool is to be inserted, said barrel having an annular groove, and a retainer for holding the working tool in place comprising arcuate parts forming a sleeve for telescoping engagement with the end of said barrel, an inner rib on said parts to fit said barrel groove, a coil spring encircling said parts to hold the same in assembled relation and in engagement with said barrel, flanges on said parts at one end forming an abutment or shoulder for one end of said spring, a sliding abutment for the other end of said spring'in the form of an annulus telescoping over said sleeve, and means on said parts controlled by said annulus for engagement with said tool.

8. In combination, a percussive motor having a barrel into which the shank of a working tool is to be inserted, and a retainer for holding the working tool in place comprising arcuate parts forming a sleeve for telescoping engagement with the end of said barrel, interfitting means on said barrel and on said parts, a coil spring encircling said parts to hold the same in assembled relation and in engagement with said barrel, flanges on said parts at one end forming an abutment or shoulder for one end of said spring, a sliding abutment for the other end of said spring in the form of an annulus telescoping over said sleeve, stop pins extending through radial bores in the outer ends of said sleeve 5 parts, and means on said annulus for locking said pins in engagement with said tool in one position of said annulus and permitting partial withdrawal of said pins in another position of said annulus to release said working 10 tool.

9. A retainer device in the form of a sleeve for engagement with the barrel of a percussive motor comprising a plurality of parts forming the sleeve, fixed abutment means on said parts at one end thereof, an annulus for telscoping engagement with said sleeve parts with a sliding fit, inwardly projectable members on said parts controlled by said annulus, and a coil spring encircling said parts and compressed between said abutment means and said annulus.

10. A retainer device in the form of a sleeve for engagement with the barrel of a percussive motor comprising a plurality of parts forming the sleeve, a rib or flange on the exterior of said parts at one end thereof to form an abutment shoulder, said parts having a series of radial bores at the other ends thereof, stop pins in said bores, an an- 39 nulus having a portion for engaging said parts with a telescoping sliding fit, a tapered portion for engagement over the heads of said pins, and a portion to hold said pins at the limit of their inward movement, and

a coil spring for encircling said parts between said abutment shoulder and said annulus.

Signed by me at Detroit, in the county of Wayne and State of Michigan, this 18 day of April, 1929.

GEORGE T. HARCOURT. 

